Hedge Mustard. Sisymbrium officinale (L.) Scop. Flowers yellow, seeds reddish brown or yellow, oblong, while lying on the flat side, circular in outline at the middle as viewed from the edge, straight on one side from the middle tapering to each end. 1–1.5 mm. long. Mucilaginous when wet. Cotyledons incumbent. Introduced from Europe.
Fig 99. [Penny Cress. Thlaspi arvense] L.
![[Penny Cress. Thlaspi arvense]](#1525880611323293367_fig-099.jpg.id-2791340933668218158.wrap-0.html.html){kind=link}
Penny Cress. Thlaspi arvense L. Flowers white; pods thin, double convex, nearly circular; seeds deep reddish brown, flat-oval or ovate, covered on each side by 12–14 curved ridges which originate and terminate at the narrow extremity. 1.5–2 mm. long. Cotyledons accumbent. When eaten by cows the milk and meat has a disagreeable taste. A bad weed, especially in the north-west. Introduced from Europe.
ORPINE FAMILY. CRASSULACEAE.
Fig 100. [Mossy Stonecrop. Sedum acre] L.
![[Mossy Stonecrop. Sedum acre]](#1525880611323293367_fig-100.jpg.id-3154816736785445040.wrap-0.html.html){kind=link}